Agitating and settling tank.



.I. E. ROTHWELL.

AGITATING 'AND S ETTLING TANK.

APPLICATION man APR. 11. 1914. RENEWED SEPT. 10. 1915.

1,179,658. Patented A r.18,1916.

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v .AGITATING AND SETTLING TANK.,

APPLICATION FILED APR. ll, I914. RENEWED SEPT. 10. 1915.

1,179,658. Patented Apr. 18, 1916.

2 SHEETS-SHEET 2- 911559853 fni eiazol's m John if Romy ea MOCJM following is a specification.

JOHN E. ROTHWELL, OF BUTTE, MONTANA, ASSIGN' OB TO COLORADO IRON WORKS COMPANY, OF DENVER, COLORADO, A. CORPORATION. OF MAINE.

AGITATING AND SETTLING TANK.

Specification of Letters Patent. Patnted Apr. 18, 1916.

Application filed April 11, 1914, Serial No. 831,298. Renewed September 10, 1915. Serial No. 50,107.

To all whom itmay concern Beit known that'I, JOHN E. RoTHwELL, a subject of the King of Great Britain, residing at Butte, Montana, have invented certain new and useful Improvements in Agitating and Settling Tanks, of which the My present invention relates to improvements in agitating tanks used in the leaching of ores and other products, and has among othersfor its objects-to provide a simple, economical and efiicient form of apparatus to which pulp is delivered to be agitated, and ,which is provided with an overflow for the clear liquor, means such as an annular partition being provided Which divides the tank into a settling portion or space, and an agitating portion or space. The invention lncludes the novel construction hereinafter described and particularly defined by the appended claims. In the accompanymg drawlng, Figure 1 shows a central vertical section through an I agitating and settling tank embodying my invention; Fig. 2 is a plan view Fig. 3 is a sectional detail of the sampling vane;

I Fig. 4 is a section on line H of Fig. 3.

Referring by reference characters to these drawings, the numeral 1 designates a tank,

preferably circular, to which the pulp issupplied by a pipe 2 leading from any suitable source (not shown). The lower portion or bottom of.the tank is preferably of conical form, as indicated at 1*. Within the upper portion of the tank is located an annular partition or skirt 3 which flares outwardly and downwardlv, so as tobe larger at the bottom than at the top, and this partition divides the upper portion ofthe tank into two spaces, an inner. agitating space B and an outer annular quiet settling space B The supply of pul to the tank or vessel is through the agitating space B, as shown in the drawing. 1 Within the tank and extending froma point near the bottom upward to near thejupper end thereof is a cylindrical pipe 4 supported fro-m the walls of the tank by braces, as indicated at 5, and within this cylindrical pipe or casing is an inner pipe or tube 6. .This inner pipe 6 is 0 en at thebottom, but the annular space formed between the pipes 6 and 4 is closed at the bottom, and this annular space communicates by a valve. pipe 8 with suitable elevating means such. for instance,

withdrawing the pulp.

as an air lift indicated'at 9. By means of this pipe 8 and'the air lift 9 the material is drawn from the lower portion of the annular chamber 7 formed by pipes 6 and 4, and caused to flow upwardly. through the pipe 6, carrying with it the material which i has settled in the lower portion of the coneshaped bottom of the tank 1. It will be understood that the air lift is shown as rep- 'resentative of any suitable means for withdrawing the material from said annular space and forcingit up through the central I p pe to carry up the settled material. The

pipe 6 communicates at its upper end with a distributing plate or cone 10 which is surrounded by an annular flange 10*.

At 11 is indicated the adjustable cutting or sampling vane. or box by means of which a proportional quantity of the material may be conductedaway from the tank. This is placed beneath the opening between 10 and 10, so that it catches a part of the material flowing down" over the spreader 10, which can be passed to a following tank. .There is or fine, and this will avoid the accumulation of the coarsest of the sands in the tank. The purpose of part 10 is to prevent the material coming up through pipe 6 from splashing out so far as to make the operation of the sampling vane unreliable. The sampling vane or box is provided with a cover U hinged at V.

W is the shaft to which the hand'wheel W is fixed, and the lever X is also fastened to this shaft and connected by link X to a lug on the cover. Turning the hand wheel therefore raises the cover and permits the variation of the width ofthe slit in the terialwithin the flaring skirt or partition .to pass upward between pipes 12 and. 4, and

. downward between pipes l and 6..

ported by means such as a flexible element 14: passing over pulleys and provided with counterweight 15. I

Having thus described my invention what Iclaim is:

1. An apparatus of the class described comprising a tank, means for maintaining agitation'therein, means for simultaneously withdrawing clear liquid therefrom and means above the normal level of the con tents of the tank for withdrawing a portion I of the material circulated through the agitation means.

2. An apparatus of the class described withdrawing clearliquid therefrom and 'adjustable means above the normal level of the contents of the tank for withdrawing a portion of the material circulated through the agitation means. I In testimony whereof, I afiix my signature in presence of two witnesses.

, JOHN E. ROTHWELL'.

Witnesses: I 1

' EDWIN P. SINTER,

Bmoos R. KINNEY. 

